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문광주,조석연,한진석 한국대기환경학회 2013 Asian Journal of Atmospheric Environment (AJAE) Vol.7 No.3
The water uptake by fine aerosol in the atmosphere has been investigated at Gosan, Korea during ABCEAREX 2005. The concentration of inorganic ion and carbon components, size distribution, and light scattering coefficients in normal and dry conditions were simultaneously measured for PM2.5 by using a parallel integrated monitoring system. The result of this study shows that ambient fine particles collected at Gosan were dominated by water-soluble ionic species (35%) and carbonaceous materials (18%). In addition,it shows the large growth of aerosol in the droplet mode when RH is higher than 70%. Size distribution of the particulate surface area in a wider size range (0.07-17 μm) shows that the elevation of RH make ambient aerosol grow to be the droplet mode one around 0.6 μm or the coarse mode one, larger than 2.5 μm. Hygroscopic factor data calculated from the ratio of aerosol scattering coefficients at a given ambient RH and a reference RH (25%) show that water uptake began at the intermediate RH range,from 40% to 60%, with the average hygroscopic factor of 1.10 for 40% RH, 1.11 for 50% RH, and 1.17 for 60% RH, respectively. Finally, average chemical composition and the corresponding growth curves were analyzed in order to investigate the relationship between carbonaceous material fraction and hygroscopicity. As a result, the aerosol growth curve shows that inorganic salts such as sulphate and nitrate as well as carbonaceous materials including OC largely contribute to the aerosol water uptake.
한진석,이석조,김정은,김영준,문광주 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.E1
Size distribution of particulate water-soluble ion components was measured at Gosan, Korea using amicro-orice uniform deposit impactor(MOUDI). Sulfate, ammonium, and nitrate showed peaks in threep1.8m).One peak was observed in the condensation mode(0.218~ 0.532m), and the other peak was obtained inthe droplet mode(0.532~ 1.8m). Considering the fact that the equivalent ratios of ammonium to sulfateranged from 0.5 to 1.0 in these size ranges, it is inferred that they formed sufficiently neutralizedcompounds such as (NH4)2SO4 and (NH4)3H(SO4)2 during the long-range transport of anthropogenicpollutants. On the other hand, nitrate was distributed mainly in the coarse mode (3.1~ 6.2m) combinedwith soil and sea salt.centrations of criteria air pollutants were relatively high, but the other represented relatively clean airquality. The concentrations of sulfate and ammonium particles in droplet mode were the highest in winterand the lowest in summer. When the air quality was bad, the increase of nitrate was observed in thecondensation mode (0.218~ 0.282m). It thus suggests that the nitrate particles were produced throughthe high temperature and relative humidity.